View Sharp LC-45GD1E (serv.man29) Service Manual online
48
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE (TU-45GD1E)
No power supply (Front LED is not ON)
Is power cable properly connected to the main unit?
Is F701 normal?
Is F702 normal?
Reconnect the wire harness, FFC, etc. in the set, and repeat
the check.
the check.
Connect the power cable properly, and turn on the power.
Replace F701, and turn on the power. If the fuse is still
blown, replace VZ701, D701, Q705 and Q706, and repeat
blown, replace VZ701, D701, Q705 and Q706, and repeat
Replace F702, and turn on the power. If the fuse is still
blown, replace D701 and IC701, and repeat the check.
blown, replace D701 and IC701, and repeat the check.
Remove the faulty part or short-circuit, and repeat the check.
Check IC902 and its peripheral
NO
NO
NO
Is there any faulty part or short-circuit in BU+5V line?
NO
NO
YES
YES
Is BU+5V line (PI/CN901) normal?
YES
YES
YES
No power-up (Front LED does not change from red to green)
Are MDR (gray) and DVI (white) connectors of the system
cable properly connected to the Display and the AVC system?
cable properly connected to the Display and the AVC system?
Reconnect properly and turn on the power.
NO
Is the power switch of the Display ON?
Set the power switch of the Display to ON, and turn on the
power.
power.
YES
NO
Is specified voltage available at S-Vcc+15V (pins (11) and
(12) of PA/P1752), UR+10V (pin (5) of PA/P1752) and
BS+10V (pins (7) and (8) of DP/P1781)?
(12) of PA/P1752), UR+10V (pin (5) of PA/P1752) and
BS+10V (pins (7) and (8) of DP/P1781)?
Is specified voltage available at D+1.8VCV (pins (3) and (4)
of PB/P1703), D+3.3V (pins (9) and (12) of PF/P1701), D+5V
(pin (1) of DP/P1703) and UR+6V (pin (7) of PF/P1701)?
of PB/P1703), D+3.3V (pins (9) and (12) of PF/P1701), D+5V
(pin (1) of DP/P1703) and UR+6V (pin (7) of PF/P1701)?
Reconnect the wire harness, FFC,
etc. in the set, and repeat the check.
etc. in the set, and repeat the check.
Are PS_ON (pin (6) of PF/P1701) and EU_D_POWER (pin
(2) of PG/P1702) at "HI" (3V or higher)?
(2) of PG/P1702) at "HI" (3V or higher)?
Are MOS-FET (Q1701, Q1702, Q1703, Q1704 and Q1705)
and IC952 normal?
and IC952 normal?
Does OVP line pin (2) of PF/P1701
voltage fluctuate immediately after
the power is supplied?
voltage fluctuate immediately after
the power is supplied?
Is specified impedance available in S-Vcc+15V, UR+10V and
BS+10V lines? (Measure the resistance between each +B
line and GND.)
BS+10V lines? (Measure the resistance between each +B
line and GND.)
Check PS_ON or EU_D_POWER line.
Check the circuits in the faulty line.
Check D_POW line (pin (8) of
PF/P1701).
PF/P1701).
Is D_POW line normal? Are the pins
(45),(46), (47) and (48) of IC1701 at
"HI", and the pin (5) of IC952 at
"LOW"?
(45),(46), (47) and (48) of IC1701 at
"HI", and the pin (5) of IC952 at
"LOW"?
Replace faulty FET or IC.
YES
NO
NO
NO
YES
YES
YES
YES
NO
Replace IC1701.
YES
YES
NO
NO
NO
YES
49
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (1) (Output from external input terminals)
Connect an external unit to CENTRE CHANNEL
INPUT
. Does the audio
come out of Display-Speaker?
Is there the audio signal input at the CENTRE CHANNEL
INPUT
terminal (J1
105)?
Are the inputs at pins (1) and (2) and the output at pin (9), all on IC2515
(A/D-CON), as specified?
Check to see if "Centre Channel Input" on MENU Option is set at "Of
f". If so, set it
to "On".
Check IC2515 (A/D-CON), power line (pin (6)) and their peripheral
circuits.
Check the 1bit
AMP
,
AUDIO IF UNIT
circuitry
, DISPLA
Y
OUTPUT
3
terminal (SC6001) and their peripheral circuits.
Check the CENTRE CHANNEL
INPUT
terminal (J1
105) for short-
circuit, wrong contact, poor soldering, etc.
YES
YES
YES
Are the input at pin (6) of IC2510 (S-DSP) and the outputs at pins (28)
and (29) of IC2514 (Codec) as specified?
Is there the audio signal at 1bit
AMP
,
AUDIO IF UNIT
circuitry and
DISPLA
Y
OUTPUT
3 (SC6001)?
Check the system cable and display
.
Check IC2515 (A/D-CON), IC2514 (Codec), power line and their
peripheral circuits.
NO
NO
NO
NO
YES
YES
YES
No sound (1) (Output from external terminals)
No Head phone sound output.
Are output from Pins (26)(27) of IC2514
(CODEC) and Pins (1)(7) of "HP-R/L-
IN"~IC2502 (HP_AMP) and the Q2501
(HP_MUTE) circuit normal?
Check the Headphone terminal (J2402) and
peripheral circuits.
No audio output from External Speakers.
(SPEAKER-
B
T
erminal)
In the
AUDIO-IF PWB : Is RELA
Y
(R
Y6000)
normally operated?
In the
AUDIO-IF PWB : Is the "H" signal
coming to "SP-SW" of Pin (1) of SF-
Connector?
In the
A
V
PWB : Is the "H" signal output to
Pin (6) of IC3808?
In the
A
V
PWB : Confirm IC3808 SDA3-1
LINE and peripheral circuits.
Is "Speaker Setup" in the MENU-Set up set
to "SPEAKER-B"?
If not, set the "SPEAKER-B".
No audio output from Optical-Audio-OUT
(IC1
109).
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
YES
Check the "HP-PLUG" signal Line.
Check Pin (4) of Headphone (J2402) thru
Pin (1
1) of IC2509.
Replace IC1
109 or check peripheral circuits.
Check the SPDIF signal from Pin (40) of
MA-Connector (P3802) and Pin (15) of B/B-
Connector (P8903).
Replace IC8903 or check peripheral circuits.
Replace IC8601 or check peripheral circuits.
Replace IC2507 (OPT
-SW) or check
peripheral circuits.
NO
NO
NO
NO
NO
Is output from Optical-Fiber
T
ransmitter
(IC1
109) normal?
Is input into Pin (12) of IC2507 (OPT
-SW)
normal?
In the DVB-T
PWB : Is output from Pin (2) of
IC8903 (INV) coming?
Is output from Pin (AC16) of IC8601
(Processor) normal?
Is output from Pin (8) of IC2507 (OPT
-SW)
normal?
(At digital broadcast reception)
50
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (2) (On the reception of TV broadcasting)
No Display audio output.
1) Is a Headphone connected?
···Disconnect it.
2) In the MENU-Option, is "Audio Out" set to "Fixed"?
···Set it "Fixed".
3) In the MENU-Option, is "Centre Channel input" set to "of
f"?
···Set it "of
f".
4) In the MENU-Set up, is "Speaker Setup" set to "SPEAKER-A"?
···Set it "SPEAKER-A".
YES
NO
NO
NO
NO
YES
YES
YES
NO
In the
AUDIO-IF PWB : Is the
AUDIO
signal coming to RELA
Y
R
Y6000 and
R
Y6001?
In the
AUDIO-IF PWB : Is the
AUDIO
signal input to SC-Connector (P6003)?
Is the
AUDIO signal input to the 1 bit-
AMP
UNIT?
In the
A
V
UNIT
: Is the
AUDIO signal
output to Pins (27)(28) of IC2514?
Confirm IC2514 (CODEC), IC2501 (MSP)
and peripheral circuits.
Is the
AUDIO signal output to DISPLA
Y
-
OUTPUT3 (SC6001)?
Is the connection of System cable (black)
normal?
(Display Side)
Display Side : Is the
AUDIO signal input to
AUDIO-Connector (J2201) and SO-
Connector (P2201)?
Display Side : Is the connection of SO-
Connector (P202) and SP-terminal (P203)
in the SP-UNIT
normal?
Are the connection in the SP-KUMI and
the Speaker normal?
51
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (2) (On the reception of TV broadcasting)
Is the SIF audio signal input to Pins (67)(69)
of IC2501 (MSP)?
No audio output on the reception of
UHF/VHF
.
Is the SIF signal output from Pin (7) of
TUNER (TU1
101)?
Check the
TUNER (TU1
101) and its
peripheral circuits.
Check the signal LINE of Pins (33)(34) of
IC2501 thru Pins (32)(33) of IC2514 and
peripheral circuits.
YES
NO
NO
Check IC2514 and peripheral circuits.
Confirm the connection of 1 bit-AMP
and
replace it.
Check the SP-SW and 1B-RELA
Y
signals
are coming to Pins (1)(2) of SF connector
.
YES
YES
YES
YES
Is the audio signal of Pins (33)(34) of IC2501
(MSP) thru Pins (32)(33) of IC2514
(CODEC) normal?
Is each audio output from Pins (28)(29) of
IC2514 normal?
Is audio output of Pins (28)(29) of IC2514
thru 1 bit-AMP
input (SA/CNA101) normal?
Is output from 1 bit-AMP
(SC/CNA102)
normal?
Is connector of
AUDIO-I/F PWB (SC/P6003)
thru Relay switching of R
Y6001 (SPEAKER
ON/OFF switching) and R
Y6000 (SPEAKER
A/B switching) normal?
Check DISPLA
Y
-OUTPUT3 (SC6001) and
SYSTEM-CABLE (BLACK).
NO
YES
YES
NO
NO
NO
NO
No audio output on the reception of DTV
.
Is the MAIN-L/R signal of Pins (52)(54) of
IC3801 thru Pins (56)(57) of IC2501 coming
normally?
Is the DTV
-L/R signal coming to Pins
(59)(61) of IC3801 (A
V
-SW) normally?
DVB-T
UNIT
: Is the L/R audio signal output
from Pins (27)(29) of P8903?
Check IC3801 (A
V
-SW) and peripheral
circuits.
Confirm the connection of Pins (27) thru (29)
of MA-connector (P3802) and B/B (P8903).
Check IC8904 and peripheral circuits.
Check IC8905 and peripheral circuits.
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is the L/R audio signal output to Pins
(91)(95) of IC8905?
Is the digital signal input to Pins (15-17)(19)
of IC8905?
Check IC8801-8802, IC8804-8805,IC8601
and peripheral circuits.
Check the connection of SA
connector and
to 1 bit-AMP
.
1) Is a Headphone connected?
···Disconnect it.
2) In the MENU-Option, is "Audio Out" set to "Fixed"?
···Set it "Fixed".
3) In the MENU-Option, is "Centre Channel input" set to "of
f"?
···Set it "of
f".
4) In the MENU-Set up, is "Speaker Setup" set to "SPEAKER-A"?
···Set it "SPEAKER-A".
